Dental-matrix retainer.



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APPLICATION FILED FEB 21,1905

CLOSSON M. LEFFINGVVELL, OF LITTLE FALLS, MINNESOTA.

DENTAL-MATRIX RETAINER.

Specification of Letters Patent.

r-atented. March 6, 1906.

Application filed February 21, 1905. Serial No. 246,796.

To all whom it may concern.-

Be it known that I, CLossoN M. LEFFING- WELL, a citizen of the UnitedStates, residing at Little Falls, in the county of Morrison and State ofMinnesota, have invented new and useful Improvements in Dental-MatrixRetainers, of which the following is a specification.

This invention relates to dental-matrix retainers.

The objects of the invention are to improve and simplify theconstruction of such devices; furthermore, to increase their efliciencyin operation.

With the foregoing and other objects in view, which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed as a practical embodiment thereof.

In the accompanying drawings, forming part of this specification, Figure1 is a plan view of a matrix-retainer constructed in accordance with theinvention. Fig. 2 is a side elevation thereof. Fig. 3 is a horizontalsection, and Fig. 4 is a transverse section through the swiveled head.

Like reference numerals indicate corresponding parts in the differentviews.

The reference-numeral 1 indicates a block which is formed in itsopposite sides with recesses in which are pivotally mounted clampingmembers 2 3. members 2 and 3 is formed on its inner face with a shoulder4, which cooperates with a' similar shoulder 5, formed in the recess ofthe block, the shoulders 4 and 5 being adapted to exert a biting actionon the matrix-retainer band 6. In addition to the shoulders 4 each ofthe clamping members 2 and 3 is also formed with a shoulder 7, thefunction of which is to limit the extent to which the ends of thematrix-retaining band 6 may pass into the block 1. Each of the clampingmembers 2 and 3 is formed on its outer side with a pair of projections 8and 9, which serve to limit the movement of a ring 10. The rear sides 11 of each clamping member between the projections 8 and 9 are inclinedoutwardly, as shown, so that when the ring 10 is moved toward the rearend of the device the clamping members 2 and 3 may be separated torelease the matrix-retaining band 6, and When said ring is Each of theclampingmoved toward the forward end of the device the clamping members2 and 3 are locked together, so as to hold the matrix-retaining band 6securely in position.

Extending longitudinally through the block 1 is a screw-shaft 12, to therear end of which is removably secured a finger-piece or disk 13 for usein rotating the shaft. Swiveled upon the forward end of the shaft 12 isa head 14, the forward end of which is channeled, as indicated at 15. Onopposite sides of the channel portion 15 the head 14 is formed withopen-ended slots 16, adapted to receive the matrix-retaining band 6.

While the block 1 ma be formed of a single piece of material, ifdesired, said block preferablycomprises a strip 1, of sheet metal, whichis bent upon itself, as shown in Fig. 2, and secured in any suitablemanner, as by solder or rivets, to afilling-piece 1.

Having thus described the invention, What is claimed as new is 1. Adental-matrix retainer having pivoted clamping members formed on theirouter edges with projections, and a ring surrounding said clampingmembers between said projections.

2. A dental-matrix retainer having an adjustable slotted head adapted toabut against a tooth and having a channel in its forward end.

3. A dental-matrix retainer comprising a block, means for securing amatrix-retaining band to said block, a screw-shaft extending throughsaid shaft, and a head swiveled on said screw-shaft and formed withslots, said head being adapted to abut against a tooth and having achannel in its forward end.

4. A dental-matrix retainer comprising a block, clamping memberspivotally connected with said block and having projections ontheir outeredges, a ring surrounding said block and clamping members between saidprojections, a screw-shaft extending through said block, and a headswiveled on the forward end of said screw-shaft, said head being formedwith a channel and having openended slots on opposite sides of saidchannel.

In testimony whereof I aflix my signature in presence of two witnesses.

CLOSSON- M. LEFFINGWELL.

Witnesses:

N. N. BERGHEIM, I. J. BAOHANT.

